Barrier oxide film vs. salt layer formation on bismuth in tartaric acid solutions

1995 ◽  
Vol 40 (5) ◽  
pp. 591-598 ◽  
Author(s):  
M. Bojinov ◽  
I. Kanazirski ◽  
A. Girginov
Keyword(s):  
Oxide Film ◽  
Tartaric Acid ◽  
Acid Solutions ◽  
Layer Formation ◽  
Salt Layer

scholarly journals Studying the Insulating Properties of Oxide Films Obtained on the Ti6A14V Alloy in Tartaric Acid Solutions Using the Method of Electrochemical Decoration by Copper

2021 ◽  
Vol 15 (4) ◽  
pp. 526-535
Author(s):  
Oleksiy Pylypenko ◽  
◽  
Olga Smirnova ◽  
Olga Skorynina-Pohrebna ◽  
Oleksandr Khoroshev ◽  
...  
Keyword(s):  
Oxide Film ◽  
Tartaric Acid ◽  
Current Density ◽  
Electrolyte Concentration ◽  
Formation Rate ◽  
Oxide Films ◽  
Anode Current Density ◽  
Acid Solutions ◽  
Wide Range ◽  
Polarization Dependences

The investigation data of the formation peculiarities of oxide films on the Ti6A14V alloy in tartaric acid solutions have been given. It is shown that the behavior of alloy forming dependences is conditioned by the anode current density. At ja < 0.5 A∙dm-2 the continuous oxide film is not formed on the alloy surface and the preset value of the final voltage on the cell is not reached. With an increase in ja > 0.5 A∙dm-2, alloy forming dependences show a linear behavior that is indicative of the formation of low porous films. In these conditions, the oxide film formation rate is in direct proportion to the value of ja. The electrochemical oxidation of Ti6A14V alloy in tartaric acid solutions results in the formation of interference-colored oxide films. The oxide film ultimate thickness and color are defined by the preset voltage and are independent of the current density and electrolyte concentration. The isolating properties of obtained films were studied by the way of the cathode polarization of oxidized specimens in the sulfate copper-plating electrolyte. The research done allows us to make a conclusion that electrochemical copper deposition is a convenient tool for the detection of defective spots in oxide films. It is shown that due to the specific features of the reduction kinetics of Cu2+ ions on the oxidized titanium it is reasonable to use for the studies the initial sections of polarization dependences that correspond to ΔE = 0.2–0.25 V. The alloy polarization dependences allow us to establish unavailability of apparent dependences between the oxidation current density, the electrolyte concentration, the cell final voltage value and the polarization that occurs during the Cu2+ ion reduction. The anodic connection of copper-coated specimens conditions the reversible dissolution of a greater portion of the specks of copper deposits. It is indicative of the electron conduction of film defects. The obtained data allow us to vary the electrolysis parameters in a wide range with no significant influence of the treatment mode of Ti6A14V alloy on the quality of oxide coatings.

Kinetic studies on the dissolution of the anodic oxide film on titanium in phosphoric acid solutions

1987 ◽  
Vol 27 (5) ◽  
pp. 453-462 ◽  
Author(s):  
F. El-Taib Heakal ◽  
A.S. Mogoda ◽  
A.A. Mazhar ◽  
M.S. El-Basiouny
Keyword(s):  
Oxide Film ◽  
Phosphoric Acid ◽  
Kinetic Studies ◽  
Anodic Oxide ◽  
Anodic Oxide Film ◽  
Acid Solutions

Leaching of Pewterware by Organic Acids

1977 ◽  
Vol 60 (6) ◽  
pp. 1408-1413
Author(s):  
John H Gould
Keyword(s):  
Organic Acids ◽  
Tartaric Acid ◽  
Atomic Absorption Spectrophotometry ◽  
Leach Solution ◽  
The Other ◽  
Acid Solutions ◽  
Absorption Spectrophotometry ◽  
Acid Leach ◽  
Mineral Acids ◽  
Tartaric Acid Solution

Abstract Three pewter goblets were repeatedly leached by acetic, citric, lactic, malonic, and tartaric acid solutions. The leach solutions were periodically analyzed for Pb, Cd, Cu, Bi, Sb, and Sn by atomic absorption spectrophotometry. Analysis of the leach solutions showed that, without the addition of nitric or perchloric acid to the acetic and malonic acid leach solutions, Pb precipitated from the solutions on standing. Addition of the mineral acids redissolved the precipitate. Pb, Cd, and Bi were found in higher concentrations in the leach solution than in the metal; Cu and Sb were less concentrated in the leach, while the amount of Sn was approximately equal in both. Tartaric acid solution dissolved about 9 times as much metal from the pewter as the other organic acids but removed less Pb than acetic or malonic acids. None of these samples tested exceeded the Food and Drug Administration standards for Pb or Cd release.

Breakdown of the niobium oxide film under galvanostatic polarisation and in acid solutions

2004 ◽  
Vol 46 (5) ◽  
pp. 1051-1060 ◽  
Author(s):  
M.B.J.G. Freitas ◽  
C. Eiras ◽  
L.O.S. Bulhões
Keyword(s):  
Oxide Film ◽  
Niobium Oxide ◽  
Acid Solutions

Discussion: Role of the Anion in Passive Layer Formation

CORROSION ◽  
1969 ◽  
Vol 25 (3) ◽  
pp. 130-130 ◽  
Author(s):  
O. L. RIGGS
Keyword(s):  
Hydrochloric Acid ◽  
Optical Microscopy ◽  
Anodic Dissolution ◽  
Passive Layer ◽  
Acid Solutions ◽  
Layer Formation ◽  
Hydrochloric Acid Solutions

Abstract This brief note is a discussion of the paper “Optical Microscopy Studies of Anodic Dissolution of Iron in Sulfuric and Hydrochloric Acid Solutions” by L. Felloni and G. P. Cammarota, “Corrosion”, 24, 90 (1968) April.

Interfacial Phenomena during Salt Layer Formation under High Rate Dissolution Conditions

2013 ◽  
Vol 117 (22) ◽  
pp. 6724-6732 ◽  
Author(s):  
Joshua A. Hammons ◽  
Alison J. Davenport ◽  
S. Majid Ghahari ◽  
Mehdi Monir ◽  
Jean-Phillipe Tinnes ◽  
...  
Keyword(s):  
Interfacial Phenomena ◽  
High Rate ◽  
Layer Formation ◽  
Salt Layer
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